Mount Marther

Mount Marther is a part of the US mountain range nearest to Naven City and its surrounding suburbs. So you should know where that is.
E/N: She's terrible with geography and probably doesn't remember which one it is herself.
As far as geographical features, it looks further away than it used to because it's become something of a base for SIVIC, which the visual effect is supposed to help people keep away from. They consistently underestimate the more dedicated hikers in our society and keep having to upgrade their security measures.
E/N: It probably doesn't help them much that you keep putting out ads proclaiming the beauty of Mount Marther so people will keep going there and unwittingly harass a secret agency.
The mount is a beautiful landmark and well worth the hike to the top. Plus, it's not so ridiculously tall as it looks so you won't have to walk nearly as much as you think. And since legally SIVIC can't put up fences or else admit they've got a base in the mountain, you're totally free to climb up there and as much as they whine about it they can't stop people from coming.

An Eclectic Ecosystem

Due in small part to my releasing some of my genetic creations into the wild, the biodiversity on Mount Marther is interesting. Since it stands slightly apart from the mountain range it tends to be something of a collection point for the odder animals. Since one of SIVIC's tenets is to minimize their harm to the environment, they're basically bound by law to take care of the ecosystem near their base. They probably would have ignored it by now but having the local wildlife be happy does help with their cover that there's no base and nothing to see here.